EXPLORATION AND EVALUATION ASSETS (Narrative) (Details) - Casino Project [Member]	12 Months Ended
Dec. 31, 2017
Statement [Line Items]
Exploration and evaluation asset, ownership percentage	100.00%
Net smelter returns royalty	2.75%
Description of nature of obligation, contingent liabilities	As part of a separate agreement, Western is required to make a payment of $1 million upon making a production decision on the Casino Project.

The description of the nature of the obligation for contingent liabilities. [Refer: Contingent liabilities [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2017-01-01
-Paragraph 86
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_86&doctype=Standard
-URIDate 2017-03-09

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